Screw and nut mechanism



New. 29, 1938. A, GjCOQLEY ET AL' 2,138,784

SCREW AND NUT 'MECH-musk: v

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ATTORNEY Nov. 29, 1938. A, G. cooLEY ET AL SCREW AND NUT MECHAISM Filed May 4, 1957 2 shams-sheet 2 INVENTOR MW@ 4.

ATTORNEY Patented Nov'. 2,9, i938 vPA'frElSn `(iF-Fica alas-,7a4 y scmzw Nur tmcnANrsir Austin G. Cooley, ancha-fora, N. J., and Gai-ett Y Vander Veer Dillenback, Jr., Slingerlands, N. Y., assigner: to Wide World Photos, Inc., New York,

' N.A Y., a corporation of New York Appll'cationMay 4, 1937, Serial No. 140,592

' 14 calins.n (ci. 75424.13) I.

customarily employed in picture ytransmissionl This invention relates to facsimile apparatus and more particularly to systems for [transmite ting pictures and other visual representations to a distance by electrical means;

embodiment of the invention,

along the line 2--2 thereof and with certain parts system, only sufficient parts of the`system are" A principal Aobject relates to l an improved organization oi' scanning apparatus for a drum type picture transmitter or receiver. .2'

A feature of the inventionv relates to an improved means for coupling a scanning drum to a lead screw or the like. l' Another feature relates to a scanning drum arrangementfor a picture transmitter or reproducer, wherein the drum is fed longitudinallydirectly by means of a lead screw, thus avoiding `the use of special gearingfand the'usual rotating countershaft. y y Another feature relates to a novel manner `of coupling and uncoupling a picture scanning diuin and its concentric lead screw shaft.

'A further feature relates to a lead screw arrangement for longitudinally feeding and rotating Va scanning drum, in conjunction with a novel form of clutch for allowing the drum to be returned along the lead screw without rotating the drum or screw.

Other features and advantages not specifically enumerated will be apparent after a consideration of the following detailed descriptions and they appended claims.

In the drawings which show one preferred y Fig. 1 is a front elevational view of a scanning drum arrangement and associated equipment according to the invention.

Fig. 2 is a vertical sectional view of Fig. 1 taken broken away.

Fig. 3 is another view similar to that yoi! Fig. l but with certain parts turned through an angle.

Fig. 4 is a verticallongitudinal section'of part of Fi2gs. 1 and 2,`taken along the line 4-4 of Fig.

Fig. 5 is a right hand end view of Fig. 4.

Fig. y 6 is -a horizontal longitudinal view in section, ofy part of Figs. 1 and 2. taken along the line 6 6' of Fig. 2.

f Fig.- 7 is a vertical sectional view of Fig. 4 taken along the line 'l--l thereof.

Inasmuch as the invention is applicable to 'any well known typeI of picture transmission shown to enables. clear .understanding of the invention to be attained'.l Accordingly in the drawings the numeral i represents any well known form of` scanning drum suoli as 'is electric cell 5.

. picture or any' other form of visual representatio'z'i, in the shape of a sheet or film, is wrapped around the drum and held fast thereon in any suitable manner, for lexample asA disclosed in detail in application Serial No. 117,347, led December 23, 1936. Associated with the drum and mounted in proper spaced relation thereto is any well known form of electro-optical system comprising for example, a source of light 2, an apertured diaphragm 3, and a.suitable 1ens system 4"for projecting an elemental scanning light spot on the picture surface. The light reiiected from each elemental area of the picture ivmpinges on a suitable light sensitive device or photomodulated or interrupted at a'regular frequency determined by theV speed of rotation of the scanning drum, and while a rotating disc light choppert is schematically shown for this purpose other well known means may be employed for producing in the output of cell S a current having a. regular frequency component for synchronizing purposes, as well as the components corresponding to the shade values of the successive' ele-- mental scanned areas of the picture. The picture currents or voltages developed in the cell 5 are suitable transmission channel to a receiving station in the manner well known in the photo--4 telegraphic art. For a detailed description of one typical system vof this character reference may be had to Patent No. 2,015,742 granted to Austin G. Cooley.

In orderto eiiect the scanning action, the drum l must be rotated around its longitudinal axis .and also advanced longitudinally along its axis. `Heretoiore this hasbeen accomplished by mounting the drum for sliding movement on one shaft and providing a counter shaft with suitable gearing to eiect the rotational and translational movements of the drum. ,-In another known sys-- iIf desired the light canI be preferably amplified and transmitted over any.

tem thedruxn carries integrally therewith a lead screw which cooperates with a threaded nut to effect the necessary scanning movement.L In ac-v -special form of releasable coupling is provided ,between the and shaft so that the drum' can be moved freely and rapidly in a longitudinal direction at any desired time.

Referring to the drawings, the drum I is provided at opposite ends with closure members 8, 9 having aligned axial openings through which passes the shaft I8. Shaft Ill is mounted in suitable bearings II, I2 in the pedestals I3, I4 which are rigidly fastened to a base I5. `Atl its left-hand end shaft I0 is coupled through suitable gearing I6 driven from a motor I1 of accurately con.-

y trollable speed. The righthand portion of shaft I0 is provided with a key-way I8 in which rides the spring pressed key I9. For this latter purpose the member 9 is formed with, o'r has yattached thereto, a tubular extension in which key I9 is mounted and a suitable spring ZI may be interposed to press the keyv into the keyway. Preferably the wall of member 20 is vertically slotted as at 22, to receive a pin 23 fastened to the key, whereby the key may' be manually disengaged from the keyway, if and when desired.

Thelefthand portion of shaft I0 is threaded and is associated with a correspondingly threaded bi-part member comprising a pair of slidable jaws 24, 25 which are normally held in engagey ment with the threads on the shaft by springs 26, 21. vFor this purpose there is provided a block 28 having a cylindrical collar 29 with a peripheral groove to provide a ball bearing racefor the ball bearings 30. The block 28 is held in place by a threaded ring V3| which is threaded into the,

closure member 8. 'As shown in Figs. 4 and 6,

lthe adjacent faces of members 8 and 3| are jaws 24, 25 is provided with projecting arms' 3B, 31 between which the springs 28, 21 extend.

In order to uncouple the drum from the threaded shaft so that it may be slid therealong without the necessity of rotating, there is provided a -cup-shaped cover-plate 38 which is mounted for rotation on Ithe portion 38a of the bushing 38h.

Bushing 38o is held lin place by screws 39 to 42 which are threaded into the projections 32 to 35. Plate 38 is thus capable of being rotated in either direction with respect to shaft I8 andls held against longitudinal displacement by members 38h and said projections 32 to 35. Plate 38 has a pair of oppositely disposed arcuate slots or cams 43, 44 which register with corresponding pins 45, 46 on jaws 24, 25..` Block 28 is provided with an arm-41 which extends downwardly through an opening in the rim of cover 38 to engage a keyway 48 in a fixed bar 49 mounted at opposite ends in pedestals I3, I4. The slots43, 44 are so shaped and positioned that by turning the cover 38 in the direction'ofthe arrows (Fig. 2) the jaws 24, 25 are moved from the `position in which they engage the shaft (Fig. 2), to a position where they disengage the shaft (Fig. 3). In both -positions of the jaws they are prevented from rotating by reason of the engagement between arm 41 and the keyway in bar 43. In other words when the jaws are in closed position (Fig. 2), rotation of shaft I0 results in a sliding movement of the drum along the said shaft, the rate of 4movement being vcontrolled by the pitch of the threads 50 'and the speed of rotation of the shaft. 0f course in this position ofthe jaws the. drum been advanced to its extreme left position, thatl is at'the completion ofthe scanning, it may be returned to its starting position, or to any intermediate position, by turning the cover 38 Whereby the jaws 2 4, 25 are uncoupled from the threaded shaft, and the drum can then be easily ,and

rapidly slid back to the desired position. This arrangement for enabling the drum to be slid to any position along the shaft can be utilized either when the said shaft vis rotating or when ite is stationary.

While certain specic apparatus and parts have been described it will be understood that the' invention is not limited thereto. For example while the drawings illustrate the invention .embodied in a transmitting drum it is equally well applicableto a receiving drum. Various other changes and modifications may be made in the disclosed embodiment without departing from the spirit and scope of 'the invention.

What is claimed is:

l. Facsimile scanning mechanism comprising a rotatable drum to support ay member to be scanned, a shaft extending axially through said drum having one portion of itslength Ithreaded and another portion slidably keyed to the drum, and a .fpair of jaws coupled to the drum and releasably engaging said threaded portion of the shaft.

2. Facsimile scanning mechanism comprising a rotatable drum to support a member to be scanned, a shaft extending axially through said drum having a threaded portion and slidably 'keyed to the drum, meansto couple the drum to the threaded portion of the shaft whereby rotation of the shaft causes the drum'to rotate and advance on the shaft, and means to release said coupling means to allow the drumto be slidalong the shaft Without rotation. p

3. Facsimile scanningl mechanism comprising a rotatable drum to support a member to be scanned, a shaft extending axiallyA through said drum having a portion threaded and another portion slidably keyed to the drum, a pair of threaded jaws, spring means normally maintaining said jaws in engagement/with said threaded portion,

an arm for controlling the separation of said jaws, y

and means to couple said jaws-to .said drum `whereby said jaws and drum'move longitudinally as a unit with said drum while allowing said drum to rotate relatively lto said jaws.

4. Facsimile scanning mechanism `comprising `a rotatable drum to support a memberto be` scanned, a `shaft slidably keyed tothe drum at one end and threaded at the other end, a pair of threaded jaws, means to maintain said rjaws normally in engagement with said threaded shaft," means to support said jaws, the last-mentioned y means having a collar to provide a bearing for said drum and coupled to said drum to move lon-v drum having a threaded portion and another portion slidably keyed-to the drum, a pair of threaded jaws, a block in`which said jaws are slidable. meansto hold said jaws in engagement with said threaded shaft portion, and cam means for controlling the openingandjelosing of said jaws. 'l i 6. Facsimile scanning mechanism comprising a rotatable drum to support a member to be scanned, a shaft extending axially through said drum, a member freely ;surrounding said shaft and carrying a pair of threaded jaws to engage said threaded shaft, means to 'support said drum at one end for rotation. around said member, means to fasten said drum to said member for longitudinal movement as a unit therewith, and means engaging said jaws to control the opening and closing thereof.

7. Facsimile scanning mechanism according vto claim 6 in which the last-mentioned means comprises a cove'r plate having a pair of slots engaging lcorresponding projections on said jaws.

8. Facsimile scanning mechanism comprising a rotatable drum to support a member to be scanned, a threaded shaft extending axially through said drum, a member mounted for rotation in one end of said drum, a pair of threaded jaws carried by said member and engaging said threaded shaft, an arm extending 'from said member, guide means vto guide the longitudinal movement of said member and arm-w'hile restraining them against rotation, and means to Vadvance said membery and drum as a unit 'along said shaft. l

9. Facsimile scanning mechanism according to 5 claim 8 in which cam means are provided to open and close said jaws. l

10. Facsimile scanning mechanism comprisin a rotatable drum to support a member to be scanned, a shaft extending axially through said drum having one end threaded, means to support said shaft for rotation, means including a sliding key to support said drum at one end on said shaft, a bar extending along said) drum in spaced relation thereto said bar having a longitudinal groove, means fastened to the other end of the drum and supported by said bar, the last-mentioned means including a member on which said other end of the drum is mounted for rotation therearound and an arm extending from said member and riding in said groove.

11. Facsimile scanning mechanism according to claim 10 in which a pair of releasable threaded jaws are carried by said member said jaws engaging the threaded end of said shaft.

12. Facsimile scanning mechanism according to claim 10 in which a pair of releasable threaded Jaws' are carried by said member said jaws engaging said threaded shaft, and a rotatable member having means to engage said jaws to open and close them.

13. Facsimile scanning Amechanism according to claim 10 in which a pair of threaded jaws arel slidably mounted in said member said jaws each having -a projection, and a rotatable member having cam-shaped slots4 registering with said projections.

14. Facsimile scanning mechanism according to claim 10 in which a pair of threaded jaws are slidably mounted in said member, said jaws being normally held in engagement with the threaded 80 end of the shaft by a pair of springs. AUSTIN G. COOLEY. GARE'I'I VANDERI VEER. DILLENBACK, Ja. 

